Bookmark.js

//
// Copyright Caleb Gates 2017
//

'use strict';

const AWS = require('aws-sdk');
AWS.config.region = 'us-east-1';
var lambda = new AWS.Lambda();
const docClient = new AWS.DynamoDB.DocumentClient({region: 'us-east-1'});


var Alexa = require("alexa-sdk");
var appId = 'amzn1.ask.skill.bf1d0fbb-b07b-4e99-ae33-2d33f583d390';
exports.handler = function(event, context, callback) {
    var alexa = Alexa.handler(event, context);
    //alexa.dynamoDBTableName = 'TABLE_NAME';
    alexa.appId = appId;
    alexa.registerHandlers(newSessionHandlers);
    alexa.execute();
};

var states = { // Currenlty Unused
    LOBBYMODE:    '_LOBBYMODE',  
};

///// CCG VARIALBES
var helpMessage = ` " Using book mark is as simple as starting the app. ". `;
var newSessionHandlers = { //Only captures new new users.
    'NewSession': function() {
      var message = ` `;
      var repromot = ` `;
        
        //IF HELP FUNCTION
         if(this.event.request.intent !== undefined && this.event.request.intent == "AMAZON.HelpIntent"){ //INVOKE WITH INTENT //UNDEFINED IS THE PROPER COMPARISON.
             this.emitWithState("AMAZON.HelpIntent");
         }

    var code = getUniqueHash(this.session.user.userId);
    var codeReadable = code.split("").join(". ");
    codeReadable = codeReadable + ". ";
    var d = new Date();
    var n = d.getTime();

        var params = {
            FunctionName: 'readDynamoDB', // Paul, your lambda function we are going to invoke
            InvocationType: 'RequestResponse',
            LogType: 'Tail',
            Payload: `{ "userId" : "${this.session.user.userId}", "code":"${code}", "time":"${n}" }` //Gets saved as event variable 
          };
        
        //this.emit == tell the user.  Note: all wordings can change. 
        
          lambda.invoke(params, function(err, data) {
            if (err) {
                    this.emit(':tell',` I'm currenlty having trouble accessing the book marking system. I appologise for the inconvenience.  `); 
            } else {
                if(data.response == "success"){ //amazon id exists, is paired with a chrome extension id -> set time stamp as bookmark
                    this.emit(':tell',` Bookmark complete `); 
                }else if(data.response == "newuser"){ //amazon id does not exists, put into database along with 4 letter code
                    this.emit(':tell',` Welcome to Book mark.  To begin... Instructions... Please enter the following 4 letter code into the chrome extension.  Your code is. ${codeReadable}` ); 
                }else if(data.response == "stillunverified"){ //amazon id does exists, but is not paired with chrome extension id
                    this.emit(':tell',` I see you still havent verified your account. Please enter your 4 letter code into the chrome extension.  Your code is. ${codeReadable}`); 
                }
            }
          });
    },
        "AMAZON.StopIntent": function() { //Can't get here
          console.log("STOPINTENT");
          this.emit(':tell', " Goodbye! ");
        },
        "AMAZON.CancelIntent": function() { //Can't get here
          console.log("CANCELINTENT");
          this.emit(':tell', "Goodbye!");
        },
        'AMAZON.HelpIntent': function() { //Alexa, ask book mark for help
            var message = helpMessage;
            this.emit(':ask', message, message);
        },
    'Unhandled': function() { //Couldn't possibly get here. 
        console.log("UNHANDLED");
        this.emit(':ask', ` I'm not sure what you said, please try again. `); 
    },
};

function getUniqueHash(userId){
    //very basic algorith to start.  Take last 4 letter and numbers if a number convert to it's equatable letter.  set all to uppercase.
    var alphabet = 'abcdefghijklmnopqrstuvwxyz';
    var lastFour = userId.substr(userId.length - 4);
    lastFour = lastFour.split('');
    lastFour = lastFour.map(function(character) { 
        if(!isNaN(parseInt(character))){
            character = alphabet[parseInt(character)];
        } character = character.toUpperCase(); 
        return character;
    });
    lastFour = lastFour.join("");
    return lastFour;
}